Denon AVR-2311, Service Manual

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69
YES
YES
Check operation of U1801.
(34) Check RESET.
Is RESET waveform con fi rmed in U1801 (38pin), when power is
turned on? (If continued to "H" or " L", proceed to "NO".)
The pattern and circuit from the HDMI connector (N1801) to the
IC(U1801) is defective, or HDMI output circuitry is defective (U1801
and surrounding circuitry).
s
(33) Check power supply.
Are 1.8V or 3.3V supplied to U1801 (each power supply pin)?
The RESET circuitry (Q1801 and
surrounding circuitry) or U1801 is defective.
The power supply circuitry is defective.
NO
NO
YES
YES
Check operation of U1601.
(31) Check RESET.
Is RESET waveform con fi rmed in N1601 (1pin), when power is
turned on? (If continued to "H" or " L", proceed to "NO".)
(30) Check power supply.
Is 1.2V supplied to C1632?
Is 3.3V supplied to C1656?
The RESET circuitry (Q1600 and
surrounding circuitry) or U1601 is defective.
The power supply circuitry is defective.
NO
NO
YES
(32) Check output signal.
Is waveform con fi rmed in R1643(1TXDE/1TXVSYNC/1TXHSYNC/
1TXPCK). (If not continued to " L", proceed to "YES".)
The U1601 is defective.
NO